Wraparound Extension Drawings in Sanderstead CR2
Fixed-fee, MCIAT-chartered wraparound extension drawings for Sanderstead (CR2) homeowners — Croydon Council validation and local constraints handled from the start.
Sanderstead (CR2) sits high on the chalk of the North Downs and developed as a 1920s–1930s suburb after the railway arrived in 1884. Its housing is predominantly interwar detached and semi-detached houses on elevated, leafy roads rather than a dense urban grain, so most householder projects here are extensions or lofts that need to sit comfortably within spacious, green streets.
There is no conservation area covering the Sanderstead part of CR2 — that is a genuine, verified fact, not an omission. Its planning character is instead shaped by the consistency of the interwar suburban layout, the generous plots and setbacks, and the London Borough of Croydon's householder design expectations, which lean on keeping the spacing between houses, original materials and roof forms intact. We treat that suburban character, rather than a conservation designation, as the reference point when we design an extension.
Demand for rear extensions, side extensions and loft conversions runs steadily across roads like Mitchley Hill, Arundel Avenue and The Ridge Way, where detached and semi-detached houses sit on generous, sloping plots. We check each property's permitted-development position against Croydon's borough-wide controls first, then prepare drawings that either stay within permitted development or are ready to validate as a full householder application.
Planning in Sanderstead (CR2): what to know before you apply
Because Sanderstead is a consistent interwar suburb of detached and semi-detached houses, Croydon assess extensions against the spacing, setbacks and green character of the street, so preserving gaps between houses and matching original materials and roof form matters alongside the numbers. There is no conservation area and no local Article 4 direction in the Sanderstead part of CR2, so many houses retain permitted development rights for rear and loft work — but generous-but-finite plots, mature gardens and the sloping topography mean depth, height and neighbour impact are the points a householder application is judged on.
Typical Sanderstead housing stock
Predominantly interwar detached and semi-detached houses on spacious, elevated plots, with mature gardens and some postwar and modern infill. Those generous plots and leafy setbacks are what shape most of the rear-extension, side-extension and loft-conversion work across the area.
Streets we regularly draw for in Sanderstead
Mitchley Hill · Briton Hill Road · Hook Hill · Church Way · Arkwright Road · The Ridge Way · Arundel Avenue · Norfolk Avenue · Onslow Gardens · Cranleigh Gardens · Blenheim Gardens · Cranleigh Close
What CR2 is actually built of
Measured from 185 classified residential buildings in CR2, not from a description of the area.
Sanderstead CR2 housing mix
Residential building form across the CR2 postcode district, from 185 classified buildings.
| Attached on more than one side | 17% |
|---|---|
| Attached on one side | 42% |
| Detached | 41% |
| Median building footprint | 92 m² |
| Addresses per buildingAbove about 2 means flats and maisonettes dominate | 1.35 |
| Buildings classified | 185 |
Source: Ordnance Survey National Geographic Database (derived statistics). Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Extracted 2026-08-17.
Wraparound Extension Drawings for Sanderstead (CR2) homes: the package and the process
A wraparound is assessed as one addition, so the drawings have to present it as one: a single proposed footprint with the rear depth and the side width both dimensioned, the roof drawn as it turns the corner, and the remaining garden shown on the site plan.
The corner is where the technical work sits. Two roof planes and two structural spans meet at the return, drainage has to get round it, and the internal opening is usually wide enough to need a designed frame rather than a single beam. We resolve that junction on the drawings before it becomes a question on site.
A wraparound needs both a rear garden and a side alley, which in practice means a terrace or end-of-terrace with an outrigger. Where only one of the two exists, the honest answer is a rear extension or a side return — the combined footprint has nowhere to turn the corner.
What makes a wraparound extension different from a rear or side return alone?
A rear extension adds depth at the back of the house; a side return adds width down the alley; a wraparound does both at once, so the new floor area turns the corner of the original building rather than sitting against just one wall. The result is typically the largest open-plan space a single-storey extension can deliver, but it also means more of the original external wall is removed and more of the roof is new, which raises the structural and drainage stakes compared with either extension on its own. Homeowners who start out planning a rear extension or a side return alone often move to a wraparound once they see how little extra it costs to combine the two, since much of the groundwork, roof structure and glazing is shared between them rather than duplicated.
Do wraparound extensions need full planning permission in London?
Almost always, yes. Permitted development allowances are calculated on combined additions to the original house, and a wraparound's depth plus width together generally exceed the volume and footprint limits that apply to a rear extension or side extension considered separately. A Lawful Development Certificate route is rarely viable for a genuine wraparound.
Conservation area status and Article 4 directions, common across the terraced streets where wraparound extensions are most popular, remove permitted development rights further still, so we design every wraparound on the assumption it will go through full householder planning.
Structural design for a wraparound extension
Because the new space turns a corner, the structural frame has to work as one continuous system rather than two independent extensions bolted together.
- A continuous steel or ring-beam frame carrying the roof around the internal corner where the rear and side elements meet
- A glazed roof lantern or rooflight strip often placed at the corner junction, where natural light reaches deepest into the combined plan
- Foundations for both the rear and side elements designed together, so they tie into the existing house consistently
- Bi-fold or sliding doors across the rear elevation, coordinated with the side glazing so the two elements read as one space
| Route | What it covers | Typical fee |
|---|---|---|
| Full planning permission | Required for almost all wraparound extensions given the combined footprint | Full Planning pack ~£1,600–£2,400 |
| Planning + Building Regulations (structural) | Combined pack including structural calculations for the L-shaped frame and drainage diversion | Planning + Building Regs pack ~£2,200–£3,850 |
| Rear extension alone (comparison) | Smaller single-storey addition, may qualify for permitted development | see Rear Extension Drawings, from £1,100 |
| Side return alone (comparison) | Widens the kitchen only, keeps garden depth unchanged | see Side Return Extension Drawings, from £1,400 |
Wraparound Extension Drawings in Sanderstead CR2 — FAQs
How much does a wraparound extension cost to design in London?+
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Is Sanderstead in a conservation area?+
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